This project is to help normalize the levels of the BOCGS VCO outputs. There are two, and they're usually either a CGS48 or an Elby CGS348. The sine and variable outputs are just putting “extra” LM3900 amps to use, and aren’t especially “good” at providing beautiful shapes or consistent levels. In particular the saw is far louder than the other waveforms (about 14 - 15 Vpp), the variable is much lower (about 2.5 Vpp) and the sine is not only low but also comes with a significant DC offset (at about 3.2 Vpp + 1.6V offset).
This is a little utility built on a bit of prototyping PCB that does the following:
- Boosts the sine and re-centers it closer to 0V
- Boosts the variable waveform
- Cuts the saw down to about 10-12Vpp
These are pretty trivial circuits, but while I saw people talking about how op amp boosters were a common way to address the level "issues" (if you see them that way), nobody seemed to have any projects / schematics for it, so here we go. Enjoy....
This is a little utility built on a bit of prototyping PCB that does the following:
- Boosts the sine and re-centers it closer to 0V
- Boosts the variable waveform
- Cuts the saw down to about 10-12Vpp
These are pretty trivial circuits, but while I saw people talking about how op amp boosters were a common way to address the level "issues" (if you see them that way), nobody seemed to have any projects / schematics for it, so here we go. Enjoy....
Statistics: Posted by elmegil — Wed Nov 27, 2024 9:18 pm — Replies 0 — Views 26